Bill Lane et al --
Yes, there is 5/8" plywood. But unless you want to support it every 12 inches
or so, get 3/4" plywood. The 5/8" will sag between supports, but 3/4" will not
unless your supports are farther apart than 17 inches or so.
Why is this so? It's because of the difference in stiffness, which in the case
of flat sheets is proportional to the cube of the thickness (not the fourth
power, as for round rod). Thus, 3/4" plywood is about 70 percent stiffer than
5/8".
Dick Karnes
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